How to resolve of corruption of undotbs without any backup and DB in Noarch

Hi Guys,
On one of my database having block corruption error, as no backup is availabe and its in noarchive mode. Previously It might be in "archvie mode"
but when access comes to me it was in no archvie mode.
database is down, when I run "startup" cmd on sqlprompt it give error as below:
ERROR at line 1:
ORA-01092: ORACLE instance terminated. Disconnection forced
and when check with alert.log file it gives as below error: corrupton of undotbs.
ORA-01578: ORACLE data block corrupted (file # 2, block # 9)
ORA-01110: data file 2: 'D:\ORACLE\TEST1\UNDOTBS01.DBF'
---I also try with below steps:
1) first take coldbackup
2) create pfile from spfile and change parameters :
undo_management to manual
comment out undo_tablespace and undo_retention
3) add one parameter as below:
allowresetlogs_corruption=true
4) add one more parameter :
corruptedrollback_segment=(_SYSSMU1$,_SYSSMU2$,_SYSSMU3$,_SYSSMU4$,_SYSSMU5$)
3) mount with pfile
4) recover database until cancel
cancel
5) alter database open resetlogs;
but the same error :(
any suggestion...

jigisha wrote:
database is in mount mode ...not able to open
and dont have any backup as well.Its a serious mistake to run the db in noarch and that too without any backup. Do NOT use those underscore parameters without OSS coming and asking you to do so. You have already fingers burnt of yours, don't make the complete hand getting burnt by using these parameters without consent of OSS. Raise an SR to oracle and do what they say.
HTH
Aman....

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